Mazda 323 lxi 1997 model keeps stalling?

Hi my car - Mazda 323 lxi 1997 model keeps stalling as I slow down and/or come to a stop at a junction or as I put the clutch down and brake.

Very occasionally, I can avoid it: As I put the clutch right to the floor in order to bring the car out of gear or change down a gear as I slow, I can see the dashboard lights come on, indicating a stall. I can bring the clutch back up quickly which brings it out of the stall, however, recently it has just keeps stalls anyway. What could be the solution?